Siemens SIMATIC User Manual

Analog modules
6.8 Analog input module SM 331; AI 2 x 12 Bit; (6ES7331-7KB02-0AB0)
S7-300 Module data
370 Manual, 06/2017, A5E00105505-AJ
Wiring: 2-, 3- and 4-wire connection of resistance transducers or thermoresistors
①
4-wire connection
②
3-wire connection, no compensation for line resistors
③
2-wire connection, no compensation for line resistors
Figure 6-19 Wiring and block diagram
Measuring range module settings
Measuring range
Measuring range module setting
150 Ω
300 Ω
600 Ω
A
RTD-4L: Thermal resistance
(linear, 4-wire connection) (temperature
measurement)
Pt 100 Klima
Ni 100 Klima
Pt 100 Standard
Ni 100 Standard
A
Note
"Resistance measurement" is only available at one channel per group. The "2nd" channel of
the group is used accordingly
for current measuring mode (I
C
).
The "1st" returns the measured value. The "2nd" channel of the group is assigned the default
overflow value "7FFF
H
."

Siemens SIMATIC Specifications

General

Product type designation	SIMATIC
CPU	Varies by model
Memory	Varies by model
Input/Output	Varies by model
Communication	Varies by model
Programming Language	STEP 7
Operating Temperature	0°C to 60°C (varies by model)
Protection Class	IP20
Category	Programmable Logic Controller (PLC)